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<body>
<div class="document" id="boost-pointer-container-library">
<h1 class="title"><img alt="Boost" src="boost.png" /> Pointer Container Library</h1>

<div class="section" id="class-ptr-sequence-adapter">
<h1>Class <tt class="docutils literal">ptr_sequence_adapter</tt></h1>
<p>This section describes all the common operations for all the pointer
sequences:</p>
<ul class="simple">
<li><a class="reference external" href="ptr_vector.html">ptr_vector</a></li>
<li><a class="reference external" href="ptr_list.html">ptr_list</a></li>
<li><a class="reference external" href="ptr_deque.html">ptr_deque</a></li>
</ul>
<p>The <tt class="docutils literal">ptr_sequence_adapter</tt> is also a concrete class that you can use to create custom pointer
containers from.</p>
<p><strong>Hierarchy:</strong></p>
<ul class="simple">
<li><a class="reference external" href="reversible_ptr_container.html">reversible_ptr_container</a><ul>
<li><tt class="docutils literal">ptr_sequence_adapter</tt><ul>
<li><a class="reference external" href="ptr_vector.html">ptr_vector</a></li>
<li><a class="reference external" href="ptr_list.html">ptr_list</a></li>
<li><a class="reference external" href="ptr_deque.html">ptr_deque</a></li>
<li><a class="reference external" href="ptr_array.html">ptr_array</a></li>
</ul>
</li>
</ul>
</li>
</ul>
<p><strong>Navigate:</strong></p>
<ul class="simple">
<li><a class="reference external" href="ptr_container.html">home</a></li>
<li><a class="reference external" href="reference.html">reference</a></li>
</ul>
<p><strong>Synopsis:</strong></p>
<pre class="literal-block">
namespace boost
{

    template
    &lt;
        class T,
        class VoidPtrSeq,
        class CloneAllocator = heap_clone_allocator
    &gt;
    class ptr_sequence_adapter
    {
    public: // <a class="reference internal" href="#construct-copy-destroy">construct/copy/destroy</a>
        template&lt; class InputIterator &gt;
        assign( InputIterator first, InputIterator last );
        template&lt; class InputRange &gt;
        assign( const InputRange&amp; e );

    public: // <a class="reference internal" href="#element-access">element access</a>
        T&amp;        front();
        const T&amp;  front() const;
        T&amp;        back();
        const T&amp;  back() const;

    public: // <a class="reference internal" href="#modifiers">modifiers</a>
        void      push_back( T* x );
        template&lt; class U &gt;
        void      push_back( <a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;U&gt; x );
        auto_type pop_back();
        iterator  insert( iterator position, T* x );
        template&lt; class U &gt;
        iterator  insert( iterator position, <a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;U&gt; x );
        template&lt; class InputIterator &gt;
        void      insert( iterator position, InputIterator first, InputIterator last );
        template&lt; class InputRange &gt;
        void      insert( iterator position, const InputRange&amp; r );
        iterator  erase( iterator position );
        iterator  erase( iterator first, iterator last );
        template&lt; class Range &gt;
        iterator  erase( const Range&amp; r );
        void      resize( size_type size );
        void      resize( size_type size, T* to_clone );

    public: // <a class="reference internal" href="#pointer-container-requirements">pointer container requirements</a>
        template&lt; class PtrSequence &gt;
        void transfer( iterator before, typename PtrSequence::iterator object,
                       PtrSequence&amp; from );
        template&lt; class PtrSequence &gt;
        void transfer( iterator before, typename PtrSequence::iterator first, typename PtrSequence::iterator last,
                       PtrSequence&amp; from );
        void template&lt; class PtrSequence, class Range &gt;
        void transfer( iterator before, const Range&amp; r, PtrSequence&amp; from );
        template&lt; class PtrSequence &gt;
        void transfer( iterator before, PtrSequence&amp; from );

    public: // <a class="reference internal" href="#algorithms">algorithms</a>

        void sort();
        void sort( iterator first, iterator last );
        template&lt; class Compare &gt;
        void sort( Compare comp );
        template&lt; class Compare &gt;
        void sort( iterator begin, iterator end, Compare comp );

        void unique();
        void unique( iterator first, iterator last );
        template&lt; class Compare &gt;
        void unique( Compare comp );
        template&lt; class Compare &gt;
        void unique( iterator begin, iterator end, Compare comp );

        template&lt; class Pred &gt;
        void erase_if( Pred pred );
        template&lt; class Pred &gt;
        void erase_if( iterator begin, iterator end, Pred pred );

        void merge( ptr_sequence_adapter&amp; r );
        template&lt; class Compare &gt;
        void merge( ptr_sequence_adapter&amp; r, Compare comp );
        void merge( iterator first, iterator last, ptr_sequence_adapter&amp; from );
        template&lt; class Compare &gt;
        void merge( iterator first, iterator last, ptr_sequence_adapter&amp; from, Compare comp );

    public: // <a class="reference external" href="ptr_list.html">ptr_list interface</a>

    public: // <a class="reference external" href="ptr_vector.html">ptr_vector interface</a>

    public: // <a class="reference external" href="ptr_deque.html">ptr_deque interface</a>

    }; //  class 'ptr_sequence_adapter'

} // namespace 'boost'
</pre>
</div>
<div class="section" id="semantics">
<h1>Semantics</h1>
<div class="section" id="semantics-construct-copy-destroy">
<span id="construct-copy-destroy"></span><h2>Semantics: construct/copy/destroy</h2>
<ul>
<li><p class="first"><tt class="docutils literal">template&lt; class InputIterator &gt;
void assign( InputIterator first, InputIterator last );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">(first,last]</tt> is a valid range</li>
<li>Effects: <tt class="docutils literal"><span class="pre">clear();</span> insert( first, last );</tt></li>
<li>Postconditions: <tt class="docutils literal">size() == <span class="pre">std::distance(</span> first, last );</tt></li>
<li>Exception safety: strong guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class InputRange &gt;
void assign( const InputRange&amp; r );</tt></p>
<blockquote>
<ul class="simple">
<li>Effects: <tt class="docutils literal">assign( <span class="pre">boost::begin(r),</span> <span class="pre">boost::end(r)</span> );</tt></li>
</ul>
</blockquote>
</li>
</ul>
<!-- - ``assign( size_type n, const T& u )``

- Effects: ``clear(); insert( begin(), n, u );``

- Postconditions: ``size() == n``

- Exception safety: Strong guarantee -->
<!-- void resize( size_type sz, const T& x );
Effects:

if ( sz > size() )
    insert( end(), sz-size(), x );
    else if ( sz < size() )
    erase( begin()+sz, end() );
    else
    ; //do nothing

Postconditions: size() == sz

Exception safety: Strong guarantee -->
</div>
<div class="section" id="semantics-element-access">
<span id="element-access"></span><h2>Semantics: element access</h2>
<ul>
<li><p class="first"><tt class="docutils literal">T&amp; <span class="pre">front();</span></tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">not <span class="pre">empty();</span></tt></li>
<li>Effects: <tt class="docutils literal">return <span class="pre">*begin();</span></tt></li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">const T&amp; front() const;</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">not <span class="pre">empty();</span></tt></li>
<li>Effects: <tt class="docutils literal">return <span class="pre">*begin();</span></tt></li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">T&amp; <span class="pre">back();</span></tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">not <span class="pre">empty();</span></tt></li>
<li>Effects: <tt class="docutils literal">return <span class="pre">*--end();</span></tt></li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">const T&amp; back() const;</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">not <span class="pre">empty();</span></tt></li>
<li>Effects: <tt class="docutils literal">return <span class="pre">*--end();</span></tt></li>
</ul>
</blockquote>
</li>
</ul>
</div>
<div class="section" id="semantics-modifiers">
<span id="modifiers"></span><h2>Semantics: modifiers</h2>
<ul>
<li><p class="first"><tt class="docutils literal">void push_back( T* x );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">x != 0</tt></li>
<li>Effects: Inserts the pointer into container and takes ownership of it</li>
<li>Throws: <tt class="docutils literal">bad_pointer</tt> if <tt class="docutils literal">x == 0</tt></li>
<li>Exception safety: Strong guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class U &gt; void push_back( <span class="pre"><a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;U&gt;</span> x );</tt></p>
<blockquote>
<ul class="simple">
<li>Effects: <tt class="docutils literal">push_back( x.release() );</tt></li>
</ul>
</blockquote>
</li>
</ul>
<!-- - ``void push_back( const T& x );``

- Effects: ``push_back( CloneAllocator::clone( x ) );``

- Exception safety: Strong guarantee -->
<ul>
<li><p class="first"><tt class="docutils literal">auto_type <span class="pre">pop_back();</span></tt></p>
<blockquote>
<ul class="simple">
<li>Requirements:<tt class="docutils literal">not empty()</tt></li>
<li>Effects: Removes the last element in the container</li>
<li>Postconditions: <tt class="docutils literal">size()</tt> is one less</li>
<li>Throws: <tt class="docutils literal">bad_ptr_container_operation</tt> if <tt class="docutils literal">empty() == true</tt></li>
<li>Exception safety: Strong guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">iterator insert( iterator position, T* x );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">position</tt> is a valid iterator from the container and
<tt class="docutils literal">x != 0</tt></li>
<li>Effects: Inserts <tt class="docutils literal">x</tt> before <tt class="docutils literal">position</tt> and returns an iterator pointing to it</li>
<li>Throws: <tt class="docutils literal">bad_pointer</tt> if <tt class="docutils literal">x == 0</tt></li>
<li>Exception safety: Strong guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class U &gt; iterator insert( iterator position, <span class="pre"><a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;U&gt;</span> x );</tt></p>
<blockquote>
<ul class="simple">
<li>Effects: <tt class="docutils literal">return insert( position, x.release() );</tt></li>
</ul>
</blockquote>
</li>
</ul>
<!-- - ``iterator insert( iterator position, const T& x );``

- Requirements: ``position`` is a valid iterator from the container

- Effects: ``return insert( position, CloneAllocator::clone( x ) );``

- Exception safety: Strong guarantee

- ``void insert( iterator position, size_type n, const T& x );``

- Requirements: ``position`` is a valid iterator from the container

- Effects: Inserts ``n`` clones of ``x`` before position into the container

- Exception safety: Strong guarantee -->
<ul>
<li><p class="first"><tt class="docutils literal">template&lt; class InputIterator &gt;
void insert( iterator position, InputIterator first, InputIterator last );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">position</tt> is a valid iterator from the container</li>
<li>Effects: Inserts a cloned range before <tt class="docutils literal">position</tt></li>
<li>Exception safety: Strong guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class InputRange &gt;
void insert( iterator position, const InputRange&amp; r );</tt></p>
<blockquote>
<ul class="simple">
<li>Effects: <tt class="docutils literal">insert( position, <span class="pre">boost::begin(r),</span> <span class="pre">boost::end(r)</span> );</tt></li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">iterator erase( iterator position );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">position</tt> is a valid iterator from the container</li>
<li>Effects: Removes the element defined by <tt class="docutils literal">position</tt> and returns an iterator to the following element</li>
<li>Throws: Nothing</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">iterator erase( iterator first, iterator last );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">[first,last)</tt> is a valid range</li>
<li>Effects: Removes the range of element defined by <tt class="docutils literal">[first,last)</tt> and returns an iterator to the following element</li>
<li>Throws: Nothing</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class Range &gt;
void erase( const Range&amp; r );</tt></p>
<blockquote>
<ul class="simple">
<li>Effects: <tt class="docutils literal">erase( <span class="pre">boost::begin(r),</span> <span class="pre">boost::end(r)</span> );</tt></li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">void resize( size_type size );</tt></p>
<blockquote>
<ul class="simple">
<li>Effects: Resizes the container. If elements are erased, it happens from the back. If elements are inserted, it happens at the back.</li>
<li>Requirements: <tt class="docutils literal">T</tt> is default constructible</li>
<li>Postcondition: <tt class="docutils literal">size() == size;</tt></li>
<li>Exception safety: Basic guarantee under expansion; nothrow guarantee otherwise</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">void resize( size_type size, T* to_clone );</tt></p>
<blockquote>
<ul class="simple">
<li>Effects: Resizes the container. If elements are erased, it happens from the back. If elements are inserted, clones of <tt class="docutils literal">*to_clone</tt> are inserted at the back.</li>
<li>Postcondition: <tt class="docutils literal">size() == size;</tt></li>
<li>Exception safety: Basic guarantee under expansion; nothrow guarantee otherwise</li>
<li>Remarks: <tt class="docutils literal">to_clone == 0</tt> is valid if the container supports nulls. The container does not take ownership of <tt class="docutils literal">to_clone</tt>.</li>
</ul>
</blockquote>
</li>
</ul>
</div>
<div class="section" id="semantics-pointer-container-requirements">
<span id="pointer-container-requirements"></span><h2>Semantics: pointer container requirements</h2>
<p>You can use <tt class="docutils literal">transfer()</tt> to move elements between two containers of the same type. Furthermore,
you can also move elements from a container of type <tt class="docutils literal">T</tt> to a container of type <tt class="docutils literal">U</tt> as long as
<tt class="docutils literal"><span class="pre">T::value_type</span></tt> is convertible to <tt class="docutils literal"><span class="pre">U::value_type</span></tt>. An example would be transferring from <tt class="docutils literal"><span class="pre">boost::ptr_vector&lt;Derived&gt;</span></tt>
to <tt class="docutils literal"><span class="pre">boost::ptr_deque&lt;Base&gt;</span></tt>.</p>
<p>(<strong>Remark:</strong> <em>When moving elements between two different containers, it is your responsibility to make sure the allocators are compatible.</em>
<em>The special latitude of being able to transfer between two different containers is only available for Sequences and not for Associative Containers.</em>)</p>
<!--  -->
<ul>
<li><p class="first"><tt class="docutils literal">template&lt; class PtrSequence &gt; void transfer( iterator before, typename <span class="pre">PtrSequence::iterator</span> object, PtrSequence&amp; from );</tt></p>
<blockquote>
<ul class="simple">
<li>Effects: Inserts the object defined by <tt class="docutils literal">object</tt> into the container and remove it from <tt class="docutils literal">from</tt>.
Insertion takes place before <tt class="docutils literal">before</tt>.</li>
<li>Postconditions: If <tt class="docutils literal">from.empty()</tt>, nothing happens. Otherwise
<tt class="docutils literal">size()</tt> is one more, <tt class="docutils literal">from.size()</tt> is one less.</li>
<li>Exception safety: Strong guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class PtrSequence &gt; void transfer( iterator before, typename <span class="pre">PtrSequence::iterator</span> first, typename <span class="pre">PtrSequence::iterator</span> last, PtrSequence&amp; from );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">from.size() &gt;= <span class="pre">std::distance(first,last)</span></tt></li>
<li>Effects: Inserts the objects defined by the range <tt class="docutils literal">[first,last)</tt> into the container and remove it from <tt class="docutils literal">from</tt>.
Insertion takes place before <tt class="docutils literal">before</tt>.</li>
<li>Postconditions: If <tt class="docutils literal">from.empty()</tt>, nothing happens. Otherwise,
let <tt class="docutils literal">N == <span class="pre">std::distance(first,last);</span></tt> then <tt class="docutils literal">size()</tt> is <tt class="docutils literal">N</tt> more, <tt class="docutils literal">from.size()</tt> is <tt class="docutils literal">N</tt> less.</li>
<li>Exception safety: Strong guarantee</li>
<li>Complexity: Linear or better</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">void template&lt; class PtrSequence, class Range &gt; void transfer( iterator before, const Range&amp; r, PtrSequence&amp; from );</tt></p>
<blockquote>
<ul class="simple">
<li>Effects: <tt class="docutils literal">transfer(before, <span class="pre">boost::begin(r),</span> <span class="pre">boost::end(r),</span> from);</tt></li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class PtrSequence&gt; void transfer( iterator before, PtrSequence&amp; from );</tt></p>
<blockquote>
<ul class="simple">
<li>Effects: <tt class="docutils literal">transfer(before, from, from);</tt></li>
</ul>
</blockquote>
</li>
</ul>
</div>
<div class="section" id="semantics-algorithms">
<span id="algorithms"></span><h2>Semantics: algorithms</h2>
<p>The general requirement for these algorithms is that the container <em>does not
contain any nulls</em>.</p>
<ul>
<li><p class="first"><tt class="docutils literal">void <span class="pre">sort();</span></tt></p>
</li>
<li><p class="first"><tt class="docutils literal">void sort( iterator first, iterator last );</tt></p>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class Compare &gt; void sort( Compare comp );</tt></p>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class Compare &gt; void sort( iterator begin, iterator end, Compare comp );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: (versions without <tt class="docutils literal">Compare</tt>) <tt class="docutils literal">bool operator&lt;( const T&amp;, const T&amp; )</tt> is defined</li>
<li>Requirements: (<tt class="docutils literal">Compare</tt> versions) <tt class="docutils literal">Compare</tt> must take <tt class="docutils literal">const T&amp;</tt> arguments</li>
<li>Effects: sorts the entire container or the specified range</li>
<li>Exception safety: nothrow guarantee (the behavior is undefined if the comparison operator throws)</li>
<li>Remarks: The versions of <tt class="docutils literal">sort()</tt> that take two iterators are not available for <tt class="docutils literal">ptr_list</tt></li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">void <span class="pre">unique();</span></tt></p>
</li>
<li><p class="first"><tt class="docutils literal">void unique( iterator first, iterator last );</tt></p>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class Compare &gt; void unique( Compare comp );</tt></p>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class Compare &gt; void unique( iterator begin, iterator end, Compare comp );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: (versions without <tt class="docutils literal">Compare</tt>) <tt class="docutils literal">bool <span class="pre">operator==(</span> const T&amp;, const T&amp; )</tt> is defined</li>
<li>Requirements: (<tt class="docutils literal">Compare</tt> versions) <tt class="docutils literal">Compare</tt> must take <tt class="docutils literal">const T&amp;</tt> arguments</li>
<li>Effects: removes adjacent and equal objects from the entire container or the specified range</li>
<li>Exception safety: nothrow guarantee (the behavior is undefined if the comparison operator throws)</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class Pred &gt; void erase_if( Pred pred );</tt></p>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class Pred &gt; void erase_if( iterator begin, iterator end, Pred pred );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">Pred</tt> must take an <tt class="docutils literal">const T&amp;</tt> argument</li>
<li>Effects: removes all elements <tt class="docutils literal">t</tt> for which <tt class="docutils literal">pred(t)</tt> returns <tt class="docutils literal">true</tt> from the entire container or the specified range</li>
<li>Exception safety: nothrow guarantee (the behavior is undefined if the comparison operator throws)</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">void merge( ptr_sequence_adapter&amp; r );</tt></p>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class Compare &gt; void merge( ptr_sequence_adapter&amp; r, Compare comp );</tt></p>
</li>
<li><p class="first"><tt class="docutils literal">void merge( iterator first, iterator last, ptr_sequence_adapter&amp; from );</tt></p>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class Compare &gt; void merge( iterator first, iterator last, ptr_sequence_adapter&amp; from, Compare comp );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: (<tt class="docutils literal">Compare</tt> versions) <tt class="docutils literal">Compare</tt> must take <tt class="docutils literal">const T&amp;</tt> arguments</li>
<li>Requirements: both sequences are sorted wrt. the same predicate</li>
<li>Effects: transfers the entire container or the specified sequence to the container while
ensuring the new sequence is also sorted</li>
<li>Postconditions: (Container versions) <tt class="docutils literal">r.empty()</tt></li>
<li>Exception safety: nothrow guarantee (the behavior is undefined if the comparison operator throws)</li>
</ul>
</blockquote>
</li>
</ul>
<hr><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Copyright:</th><td class="field-body">Thorsten Ottosen 2004-2006. Use, modification and distribution is subject to the Boost Software License, Version 1.0 (see <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt">LICENSE_1_0.txt</a>).</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
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